Key blank



FIG. 1 is a front elevational view of a key blank showing my new design;

FIG. 2 is an enlarged horizontal cross-sectional view thereof, taken midway along the length of the key blade;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a key blank, as shown and described. 